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pollen    音标拼音: [p'ɑlən]
n. 花粉
vt. 传授花粉给

花粉传授花粉给

pollen
n 1: the fine spores that contain male gametes and that are
borne by an anther in a flowering plant

Pollen \Pol"len\, n. [L. pollen fine flour, fine dust; cf. Gr.
?]
1. Fine bran or flour. [Obs.] --Bailey.
[1913 Webster]

2. (Bot.) The fecundating dustlike cells of the anthers of
flowers. See {Flower}, and Illust. of {Filament}.
[1913 Webster]

{Pollen grain} (Bot.), a particle or call of pollen.

{Pollen mass}, a pollinium. --Gray.

{Pollen sac}, a compartment of an anther containing pollen,
-- usually there are four in each anther.

{Pollen tube}, a slender tube which issues from the pollen
grain on its contact with the stigma, which it penetrates,
thus conveying, it is supposed, the fecundating matter of
the grain to the ovule.
[1913 Webster]


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  • National Allergy Forecast Info About Allergies | Pollen. com
    Pollen is an airborne allergen, which is picked up and carried by the wind Various trees, grasses and weeds create pollen, which can cause hay fever, irritate your eyes and skin
  • National Allergy Map | Pollen. com
    Today’s National Allergy Map Search, browse and select cities on our interactive allergy map to see allergy levels and pollen count forecasts
  • Pollen Count Today — Should I Go Outside? | PollenTracker
    Pollen count is a snapshot of how many pollen grains are floating in the air per cubic meter, measured at certified sampling stations or projected through forecasting models Higher counts trigger allergy symptoms like sneezing, congestion, and watery eyes
  • Pollen Count Today - Real-Time Levels by City | MyPollenPal
    See today's pollen count for your city - tree, grass weed levels updated daily Get free email alerts when conditions are bad
  • Pollen - Wikipedia
    Pollen is a powdery substance produced by most types of flowers of seed plants for the purpose of sexual reproduction [1] It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells)
  • Pollen Map: Live Pollen Count Allergy Forecast | WeatherBug
    Check the latest pollen levels across the USA Our national allergy map helps you see areas with high and low pollen counts to manage your allergy symptoms
  • Allergies and Tree Pollen Map - Weather. com
    Higher pollen counts mean that there is more pollen in the air Areas with higher or lower levels of weather-related pains based on surface pressure, humidity, precipitation, wind, and temps
  • Pollen | Description, Characteristics, Importance, Pollination, Facts . . .
    Pollen, a mass of microspores in a seed plant, usually appearing as a fine dust and varying greatly in shape and structure Each pollen grain is formed in the male structures of seed-bearing plants and is transported by various means to the female structures to facilitate fertilization of the ovules
  • Pollen Count
    Allergy season is rough, but our forecast, featuring each category of pollen producer, is here to show you when pollen levels are high! Quickly visualize today's local pollen, mold, and air quality levels near you to help manage your symptoms and avoid hay fever
  • What Does Pollen Do to You? Symptoms and Effects
    Pollen grains are tiny protein packages released by trees, grasses, and weeds When you inhale them, the grains land on the moist lining of your nasal passages and release their proteins, which diffuse across the tissue





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